To calculate your body mass index (BMI), start by measuring your height in meters and then squaring it. Then, divide your weight in kilograms by your height in meters squared to find your BMI.

Check your BMI to find out if you're a healthy weight for your height, and get advice on what to do next. This BMI calculator is for people over 18 years old.

BMI calculator online: Get your Body Mass Index results fast. Check if you're underweight, normal, overweight, or obese. It's free!

Use the interactive BMI formula calculator below to demonstrate the formula and resulting BMI calculation for your chosen weight and height figures. Options for both metric and imperial units are available.

Adult and children’s BMI calculators plus information on how to interpret the results.

This calculator provides BMI and the corresponding BMI category for adults 20 and older. For children and teens 2 through 19 years, use the BMI Calculator for Children and Teens.

How do I calculate my BMI? You can calculate BMI yourself with these steps: Multiply your weight in pounds by 703. Divide that answer by your height in inches (there are 12 inches in 1 foot). Divide that answer by your height in inches again.

Body Mass Index (BMI) offers a quick estimate of body fat based on your height and weight, helping you determine if you’re underweight, normal weight, or overweight.

Body mass index (BMI) is a measurement of body fat based on height and weight. Learn how to calculate BMI using the BMI formula and equation, as well as how to use the BMI calculator.

Find out how to calculate your body mass index (BMI) and what a healthy BMI is with our chart you can download and print. It also comes with a diary so you can keep track of your BMI over time.